This article is about the object. For the delver rank, see White Whistle rank. White Whistles are Second Grade Artifacts that can only be used by their original owner. The White Whistle is a signature characteristic for the few Delvers that are allowed to delve past the 5 th layer of the Abyss.
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Ozen "The Immovable" is a legendary White Whistle Delver who has made outstanding discoveries of the Abyss and retrieved numerous Artifacts of incredible value. Even among her fellow White Whistles, Ozen is renowned for her incredible physical strength. She is a mysterious person, shrouded by countless rumors that are absurd, but hard to refute.
An anime television series adaptation by Kinema Citrus aired its first season from July 7 to September 29, A sequel film premiered in Japan on January 17, It was scheduled to be released in U. The story follows an orphaned young girl, Riko, who finds and befriends a humanoid robot Reg and descends with it into the titular "Abyss", that leads deep into the Earth, in hopes of finding her mother. An orphaned girl named Riko lives in the Belchero Orphanage in the town of Orth.